Hardinge SUPER-PRECISION HC User manual

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MAINTENANCE MANUAL
FOR AUTOMATIC THREADING UNIT
ON
HARDINGE
SUPER-PRECISION ”
CHUCKING MACHINE
MODELHC
mm
■

READ MANUAL CAREFULL BEFORE STARTING MAIN 
TENANCE OR REPAIR ON AUTOMATIC THREADING UNIT
When this manual was printed, the information given was cur 
rent. However, since we are constantly improving the design of our
machine tools, it is possible that the illustrations and descriptions
may vary from the automatic threading unit you received. This
means that the unit you received is the latest improved model to
better fulfill your requirements.
It is assumed those who use this manual will have a general
knowledge of machine maintenance and repair. This general knowl 
edge coupled with the following manual will greatly reduce or elimi 
nate down time to allow you to receive maximum production from
your Hardinge Automatic Threading Unit.
HARDINGE BROTHERS, INC.
ELMIRA, NEW ORK

CONTENTS
V
PAGE
'
!
3
Air Connections
Chasing Head — Disassembly
8
11 Reassembly
:
7
Cycle Stop Micro Switch — Replacement
6
Cylinder Housing, Chasing Head
” !
V
7
Disassembly
7
Reassembly
Electrical Connections
4
Electric Control Functions 5
Feed Rate Adjusting Screw — Removal
6
Replacement
6
A
14
Gib Adjustment, Tool Post Slide
I
Installation, Automatic Threading Unit
3
Knockout Control — Disassembly 14
Reassembly 15
Lubricant Vendors
2
Lubrication
14, 19
Lubro-Control Unit
19
Maintenance, Preventive
2
Mounting Bracket and Chasing Bar Assembly
18
— i
Removal, Automatic Threading Unit 5
14
Serial Number
Slide Travel Adjusting Screw — Removal
6
6
Replacement
5
Tool Post — Disassembly
FOR OPERATION AND RELATED ADJUST ENTS, SEE
“ OPERATOR S ANUAL FOR AUTO ATIC THREADING
UNITS ON ODEL HC CHUCKING ACHINES ”
1

PREVENTIVE MAINTENANCE
DAILY
PAGE
14
Clean and Lubricate Lead Screw and Follower
. 14
Clean and Lubricate Guide Bar .
WEEKL
PAGE
14
Fill Oil Cup on Chasing Head
14
Cycle Threading Unit
20
Drain Filter Reservoir
SE I-ANNUALLY
PAGE
20
Clean Air Filter Element
DEPENDING ON USE
PAGE
20
Maintain Oil in Lubricator Reservoir
Note: Oil Base Cutting Fluids are Recommended for Maximum Life
of Automatic Threading Unit.
LUBRICANTS
(Use
Recommended Product or Equivalent)
Product Vendor
Standard Die Set Co. (Div. of Dieco.)
Die Makers Grease
Molylube #M-88 Alpha-Molykote
Corporation
Mobil
Oil Corporation
Velocite No. 6
2

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Figure 1 — Threading Unit Mounting Pads
Figure 4 — Rear View of Threading Unit
INSTALLATION
ON
EXISTING MACHINES
1. Remove any paint or burrs from pads “ A ” , Fig 
ure 1, and keyways in pads.
2. Position base plate “ B", Figure 2, and as 
semble eight screws “ C ” .
3. Set four T-Bolts “ D ” and “ E ” , Figure 3, in base
plate as shown. Bolts “ D ” are the longer ones
supplied.
4. Position threading unit on base plate with hoist
and sling and assemble four washers and nuts “ F ” ,
Figure 4. DO NOT OVERTIGHTEN NUTS “ F ” , SNUG
IS SUFFICIENT.
Figure 2 — Base Plate Mounting
Figure 5 — Air Control Unit Location
AIR CONNECTIONS
1. Drill two 3 /s" diameter holes 5 Vs" apart at left
rear of oil pan and mount air regulator “ G ” , Figure 5.
2.
Fill lubro-control unit with oil per instructions,
Page 19. Connect air line from threading unit to
lubro-control unit.
3. Connect lubro-control unit to air supply. If ex 
cessive water problem exists, add heavy duty filter to
air line.
3

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4. Set pressure regulator knob “ J ” , Figure 7 to
provide a minimum of 65 pounds and a maximum of
75 pounds of air pressure. Tighten lock screw “ H ”
against control knob to maintain setting.
5. Follow steps 1 & 2 on this page under “ Elec 
trical Connections ’ ’ .
ELECTRICAL CONNECTIONS
1. Disconnect power source. Feed cable “ J ” , Fig 
ure 4, through hole “ K ” , Figure 6.
2. Attach white wire to terminal 8 and black wire
to terminal 37 of terminal board. Tighten cable grip
at “ K ” .
Figure 7 — Lubro-Control Unit
4

NOTE: THREADING UNIT REQUIRES ONL 10
VOLTS FOR OPERATION. Machines manufactured
after Serial No. 100A are wired to include 10 volt tap
on transformer.
FOR INITIAL SETTING OF AUTO ATIC THREADING
UNIT, SEE OPERATOR ’ S ANUAL FOR AUTO ATIC
THREADING UNITS ON ODEL HC CHUCKING
ACHINE.
ELECTRIC CONTROL FUNCTIONS
(Figure 6)
L — Fuse for automatic threading unit. (FRN 1- 1 A )
M — Control voltage transformer (115 volt output
with 10 volt tap for automatic threading unit).
Figure 10 — Fine Adjustment Dial Assembly
AUTOMATIC THREADING
UNIT REMOVAL
1. Disconnect electrical power source and
remove wires at terminals 8 and 37, Figure 6.
2.
Loosen cable grip at “ K ” and remove cable
from main switch case.
3. Disconnect air pressure and remove air line
from threading unit at lubro-control unit.
4. Remove four nuts and washers “ F'\ Figure 4,
and remove complete threading unit with hoist and
sling.
5. If necessary, remove the T-Bolts “ D ” and “ E ”
Figure 3, and base plate “ B ” , Figure 2.
TOOL POST DISASSEMBL
Figure 8 — Tool Post Assembly
1. Remove bolt “ A ” , Figure 8. washer and tool
block “ B ” .
2. Loosen nuts “ C ” and “ D", Figure 8, and slide
tool post assembly down keyway to remove.
3. Unscrew fine adjustment dial assembly, Figure
9.
NOTE: FINE ADJUSTMENT SCREW HAS LEFT-
HAND THREADS.
4. To disassemble fine adjustment dial assembly:
(a) Remove taper pin “ E ” , Figure 10, and
unscrew dial “ F ” .
(b) Remove adjusting bolt “ G ” , nut "H ” and T-
Bolt “ J ” .
5. Remove nut “ K ” , Figure 11, washer and spring
“ L ” , Figure 12. Remove T-Bolt ‘ ‘ M ” , Figure 11.
6.
Unscrew adjusting nut “ N ” , Figure 11, from
tool post support “ O ” .
7. Reassemble. NOTE: Fine adjustment dial as 
sembly which has left-hand threads, can be threaded
into either one of two threaded holes, depending on
set up.
Figure 9 — Fine Adjustment Dial Removal
5
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Figure 11 — Tool Support and Components
Figure 13 — Chasing Head Cylinder Housing
Feed Rate Adjusting Screw Replacement
1. Replace O-ring “ F ” , Figure 14, adjusting nut
“ E ” , knob “ D ” and roll pin “ C ” .
2. Thread piston stop assembly “ B'\ Figure 13
into casting until adjusting nut “ E ” , Figure 14, is
flush with casting. Turn knob “ D ” down until it just
contacts nut “ E ” . Connect air pressure at control
unit.
3. Cycle threading unit. If unit, fails to cycle and
slide to advance, turn large white dial clockwise by
hand to stop passes. Thread adjusting nut “ E ” out
gradually per following instructions until pawl can
enter ratchet and operate chasing head.
(a) Turn knob “ D ’ \ Figure 14, counter-clock 
wise until adjusting nut “ E ” moves a frac 
tion of a turn. Tighten set screw under lock
screw “ A ” . Turn knob “ D ” down until it
just contacts nut “ E ” . Cycle threading unit.
4. When chasing head cycles, tighten set screw
under lock screw “ A ” , Figure 13, and replace screw
“ A ” .
Figure 12 — Spring for Tool Post
CHASING HEAD
C LINDER HOUSING
Feed Rate Adjusting Screw Removal
Slide Travel Adjusting Screw Removal
1. Disconnect air pressure at control unit. Loosen
set screw “ G ” , Figure 13. Do not misplace brass plug
under set screw.
2. Remove adjusting screw “ H ” , Figure 15, and
remove O-ring “ J ” .
NOTE: Feed rate adjusting screw “ B ” , Figure 13, is
factory set and sealed. Removal is not recommended
unless absolutely necessary.
1. Disconnect air pressure at control unit.
Remove wax seal from screw “ A ” , Figure 13, and
remove lock screw “ A ” . Loosen set screw under lock
screw “ A ” .
2. Unscrew piston stop assembly “ B ” . Remove
roll pin “ C ” , Figure 14, knob “ D ” , adjusting nut “ E ”
and O-ring “ F ” . Do not misplace brass plug under
screws “ A ” , Figure 13.
Slide Travel Adjusting Screw Replacement
1. Replace O-ring “ J ” , Figure 15, and start ad 
justing screw “ H ” . Connect air pressure at control
unit.
2. Set thread depth control dial at 70. Turn ad 
justing screw “ H ” , Figure 15, slowly to its limit under
normal pressure and back off Vs turn. Relock set
screw “ G ” , Figure 13.
6

9. Replace cover “ L ” , Figure 13, and seven
screws “ K ” .
10. Connect air pressure at control unit.
:
Figure 14 — Feed Rate Adjusting Screw
Cylinder Housing Disassembly
1. Disconnect air pressure at control unit.
Remove seven screws “ K ” , Figure 13, and remove
cover “ L ” . DO NOT REMOVE HOSE CONNECTORS
“ M ” , Figure 15, unless absolutely necessary as they
are extremely tight to prevent air leakage and
removal is most difficult.
2. Remove O-rings “ N ” , “ O ” , and “ P ” , Figure 16.
3. Remove piston “ Q ” , Figure 17, cylinder liner
“ R ” and two u-cups “ S ” .
4. Remove two screws “ T ” , Figure 16, and two
screws “ U ” .
5. Using open end wrench, unscrew piston rod
“ V ” , Figure 18, from tool post slide “ W ” and remove
cylinder housing “ X ” .
6. Remove nut “ ” , Figure 16, washer “ Z ” , Figure
19, piston rod “ A ” , piston plate “ B ” . Remove O-ring
“ C ” , Figure 20, piston body “ D ” , seal “ E ” and two
O-rings “ F ” . Remove cylinder liner “ G ” .
7. If necessary, remove O-ring “ H ” , Figure 21.
Figure 15 — Slide Travel Adjusting Screw Removal
Cylinder Housing Reassembly
NOTE: Lubricate O-rings, seals and cylinder walls
with Mobil Velocite No. 6 or equivalent during reas 
sembly.
1. Replace O-ring “ H ” , Figure 21.
2. Replace cylinder liner “ G ” , Figure 20, (cham 
fered side down).
3. Replace seal “ E ” and two O-rings “ F
piston body “ D ” . Replace piston body.
4. Replace piston rod “ A ” , Figure 19, O-ring “ C ” ,
piston plate “ B ” , washer “ Z ” and nut “ ".
5. Replace cylinder housing “ X ” , Figure 18, and
using open end wrench, thread piston rod “ V ” , Fig 
ure 18, into tool post slide “ W ” .
6. Replace two screws “ T ” , Figure 16, and two
Screws “ U ” . NOTE: Screws “ T ” are Vs" longer than
screws “ U ” .
7. Replace two u-cups “ S ” , Figure 17, on piston
“ Q ” . Replace cylinder liner “ R ” and piston “ Q ” .
8. Replace O-rings “ N ” , “ O ” , and “ P ” , Figure 16.
Figure 16 — Cylinder Housing with Cover Removed
on
C CLE STOP MICRO SWITCH
REPLACEMENT
1. Disconnect air line at control unit and turn dis 
connect switch on main control case to “ Off ” .
2. Remove two screws “ T ” , Figure 16, and two
screws “ U ” .
NOTE: Screws “ T ” are Vs" longer than screws “ U ” .
3. Using open end wrench, unscrew piston rod
“ V ” , Figure 18, from tool post slide “ W ” and remove
cylinder housing assembly “ X ” .
7
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4. Remove two screws “ B ” , Figure 22, and,
remove micro switch “ A ” . Remove wires from micro
switch.
5. Connect wires to normally closed and common
terminals of new micro switch. Replace switch “ A ”
and two screws “ B ” . Do not tighten screws.
6. Pull cycle start knob, set micro switch with ac 
tivator just touching plunger “ C ” and tighten screws
“ B ” .
7. Turn disconnect switch on main control case to
“ On ” . When threading unit is lowered to operating
position a click will be heard from solenoid in
knockout housing with cycle start knob “ Out ” and
will not be heard with cycle start knob “ In ” , if micro
switch “ A ” is operating properly. Turn large white
dial right-handed to retract cycle start knob.
8. Reassemble other components by reversing
steps 1,2, and 3.
Figure 19 — Piston for Slide Travel Adjusting Screw
Figure
20 — Cylinder Housing and Components
Figure
17 — Piston for Feed Rate Adjusting Screw
Figure 21 — Cylinder Housing
CHASING HEAD DISASSEMBL
1. Support guide bar bracket “ F ” , Figure 23, by
hand and loosen two bolts “ G ” . Remove guide bar
bracket.
2. Follow steps 1, 2, and 3 under “ Cycle Stop
Micro Switch Replacement ” on previous page.
3. Remove two screws “ B ” , Figure 22, and
remove micro switch “ A ” . Remove wires from micro
switch. Remove O-ring seal for micro switch.
Figure 18 — Piston Rod for Slide Travel
8

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Figure 23 — Clamping Bolts for Chasing Head and Guide Bar
Bracket
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Figure 22 — Cycle Stop Micro Switch
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4. Remove cable grip “ E ” , Figure 22, and pull
micro switch wires from chasing head.
5. Support chasing head by hand to prevent it
from dropping down, and loosen two bolts “ H ” , Fig 
ure 23. Remove head from chasing bar. NOTE: TWO
PEOPLE ARE SUGGESTED FOR STEP 5).
6. Loosen two screws “ J ” , Figure 24, and remove
dial nut “ K ” . Remove dial assembly “ L ” .
7. Remove key “ M ” , Figure 25.
8. Remove four screws “ N ” , Figure 25, and
remove cover “ O". Remove plunger pin “ P ” , Figure
26
and spring “ Q ” .
9. To Disassemble cover “ O ” :
(a) Remove pawl “ A ” , Figure 27, and O-ring
“ B ” , if necessary.
(b) Remove screw “ C ” , block “ D ” , spring “ E ”
and plunger release bar “ F ” .
(c) Remove lock screw “ G ” , Figure 28 and
loosen stop screw under screw “ G ” .
(d) Remove lock plunger “ H ” , Figure 27.
(e) Remove lock screw “ J ” , Figure 29, and
remove set screw “ K", spring “ L ” and pin
“ ” .
(f) To remove pawl block “ N ” , Figure 27,
remove two screws “ O ” , Figure 30, and
drive dowel pin “ P ” from cover.
(g) Needle bearing “ Q ” and seal “ R ” are
pressed into cover.
10. Push down on pawl post “ A ” , Figure 31, and
remove pawl “ B ” from pin “ C , \
11. Remove pawl post “ A ” , Figure 32, and remove
spring “ D ” and spacer “ E ” .
12. Remove nut “ G ” , Figure 33. Remove spring re 
tainer “ H ” , Figure 34, and remove spring “ J ” and
dial sleeve “ K ” .
Figure 24 — Thread Depth Control Dial
Figure 25 — Cover for Chasing Head
9

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Figure 30 — Cover for Chasing Head
' Figure 26 — Plunger Pin for Micro Switch
C
B
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Figure 31 — Pawl and Pawl Post
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Figure 27 — Cover for Chasing Head
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Figure 32 — Pawl Post and Components
13. Remove screw “ L ” , Figure 35, and loosen stop
screw under screw “ L ” until ratchet releases.
Remove key “ M ” , Figure 35 and retaining ring “ N ” .
14. Remove ratchet “ O ” , Figure 36. CAUTION:
Remove ratchet slowly while pushing in hole as
shown, Figure 36, with a small rod to keep ratchet
spring in place.
15. Remove ratchet spring “ P ” , Figure 37. Use
needle nose pliers, Figure 38, to remove spring over
pin “ Q ” , Figure 37, and out of casting. CAUTION:
Release spring slowly.
Figure 28 — Stop Screw for Lock Plunger
L
K J
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Figure 29 — Lock Plunger and Components
10

16. Remove lock screw “ R ” , Figure 39. Remove
slide stop pin “ S ” . Use one screw “ N ” , Figure 25, to
pull slide stop pin as shown, Figure 40.
17. Remove tool slide “ T ” , Figure 41.
18. Remove three screws “ U ” , Figure 42. Remove
cam “ V ” , Figure 43, and camshaft “ W ” .
Figure 34 — Dial Sleeve and Components
Figure 33 — Nut for Dial Sleeve
Figure 35 — Ratchet and Stop Screw
CHASING HEAD ASSEMBL
1. Replace cam shaft “ W ” , Figure 43. Line up
keyway with key and replace cam “ V ” . Replace three
screws “ U ” , Figure 42.
2. Lubricate matching dovetails on slides with M-
88 Molylube and replace tool slide “ T ” , Figure 41. If
necessary for assembly loosen gib screws and read 
just tool slide gib per instructions under “ Tool Post
Slide Gib Adjustment ” , on Page 14.
3. Replace slide stop pin “ S ” , Figure 39, and
replace lock screw “ R ” . NOTE: Position tool slide by
viewing through hole to properly locate slide stop pin
with cam.
4. CAREFULLY coil ratchet spring “ P ” , Figure 37,
by hand, and replace spring with needle nose pliers,
placing outside end over pin “ Q ” .
5. Replace ratchet “ O ” , Figure 36. Use small rod
in hole, Figure 36, to line up inside end of ratchet
spring with hole in backside of ratchet.
6. Replace retaining ring “ N ” , Figure 35, and
replace key “ M ” .
7. Replace dial sleeve “ K ” , Figure 34. Turn dial
sleeve and ratchet “ O ” , Figure 35, three full turns to
the right. Hold ratchet and turn stop screw in hole
“ L ” in until it prevents ratchet spring from un 
winding.
8. Replace spring “ J ” , Figure 34, spring retainer
“ H ” and nut “ G ” . Tighten nut “ G ” by turning until
contact is made with stop screw in hole “ L ” , Figure
Figure 36 — Ratchet Removal
9. Replace spacer “ E ” , Figure 32, and replace
spring “ D ” . Coat with M-88 Molylube and replace
pawl post “ A ” .
35.
11

V
Figure 40 — Slide Stop Pin Removal
Figure 37 — Ratchet Spring
Figure 38 — Ratchet Spring Removal
Figure 41 — Tool Post Slide Removal
Figure 39 — Lock Screw and Slide Stop Pin for Tool Post Slide
Figure 42 — Mounting Screws for Cam
12

10. Coat pawl “ B ” , Figure 31, with M-88 Molylube
and replace.
11. To reassemble cover "O ” , Figure 25:
(a) If removed, press needle bearing “ Q ” , Fig 
ure 30, and seal “ R ” in cover.
(b) If removed, replace pawl block “ N ” , Figure
27, dowel pin “ P ” , and two screws “ O ” ,
Figure 30.
(c) Coat with M-88 Molylube and replace lock
plunger “ H ” , Figure 27. Turn stop screw in
hole “ G ” , Figure 28, into elongated slot in
plunger “ H ” , Figure 29. Bottom stop screw
and back off approximately one turn.
Replace lock screw “ G ” , Figure 28.
(d) Replace pin “ M ” , Figure 29, spring “ L ”
and screw “ K ” .
(e) Coat plunger release bar “ F ” , Figure 27,
with M-88 Molylube and replace. Replace
spring “ E ” , block “ D ” , and screw “ C ” .
(f) Replace O-ring “ B ” . Coat with M-88 and
replace pawl “ A ” .
12. Replace plunger spring “ Q ” , Figure 26, and
plunger “ P ” .
13. With plunger release bar “ F ” , Figure 27, in
unlocked position as shown in Figure 27, start re 
placement of cover “ O ” , Figure 44. As cover “ O ” is
advanced push pawl “ A ” in to clear casting, pull
cycle start knob “ B ” and push pawl post “ C ” , in that
order. Replace four screws “ N ” , Figure 25. Adjust set
screw “ K ” , Figure 29, for six pounds pull to cock
plunger “ H ” . Replace lock screw “ J ” .
14. Replace key “ M ” , Figure 25.
15. Replace dial assembly “ L ” , Figure 24, replace
dial nut “ K ” and tighten two screws “ J ” .
16. Pull and set white dial as close to 70 as it will
engage. Turn stop screw in hole “ L ” , Figure 35, to
bring the 70 graduation line to the center of zero
plug in cover. Replace lock screw in hole “ L ” .
Figure 44 — Cover Replacement
17. Replace chasing head on chasing bar and
tighten two bolts “ H ” , Figure 23.
18.
Replace micro switch cable and cable grip
“ E ” , Figure 22. Replace O-ring for micro switch.
19. Follow steps 5 through 8 under “ Cycle Stop
Micro Switch Replacement ” Page 8.
20. With threading head engaged pull cycle start
knob and while holding threading head, loosen two
bolts “ H ” , Figure 23. Set threading head at 20° off
vertical Figure 45. Tighten bolts “ H ” .
21. Replace bracket “ F ” . Figure 23 per instructions
under “ Guide Bar Support Bracket ” in operator ’ s
manual.
Figure 45 — Setting Threading Head Angle
Figure 43 — Cam and Camshaft Removal
13

4. Remove four screws “ D ” , Figure 49, and
remove valve housing over two dowel pins “ E ” .
5. Remove screw “ F ” , Figure 50, and white wire.
Remove black wire from “ common ” terminal on
micro switch “ G ” .
6. Remove wire from terminal screw “ J ” and
remove wire from “ normally open ” terminal on micro
switch “ G ” .
7. If necessary, remove two O-rings “ K ” .
8. To remove air valve “ L ” :
(a) Remove red wire from terminal “ M ” , Fig 
ure 51.
(b) Remove three remaining screws “ F ” , Fig 
ure 50, and remove air valve.
(c) Remove coupling “ N ” , felt “ O ” , washer
“ P ” , spring “ Q ” and nipple “ R ” .
(d) Remove exhaust silencer “ S ” , coupling
“ T ” , nipple “ U ” and elbow “ V ” .
9. To remove micro switches:
(a) Remove remaining wires from micro
switches.
(b) Remove two screws, nuts and washers “ W ” ,
Figure 52, and remove micro switches “ G ”
and “ H ” , Figure 50.
TOOL POST SLIDE
GIB ADJUSTMENT
After considerable use it may be necessary to ad 
just the tool post slide gib. The gib is the tapered
type and adjustment is made from the large end
shown in Figure 45.
1. Follow steps 2 and 16 under “ Chasing Head
Disassembly ” , Page 8.
2. Insert V a " hexagon wrench in adjusting screw
“ A ” , Figure 45 and Figure 46. Loosen one full turn.
3. Push wrench on through into adjusting screw
“ B ” , Figure 46. Advance adjusting screw “ B ” a frac 
tion of a turn.
4. Pull wrench out of “ B ” and tighten “ A ” until
snug. Do not overtighten.
5. Test tool slide for “ feel ” — the slide should
have a slight drag but should not bind.
NOTE: Excessive gib pressure or drag does not
improve performance.
LUBRICATION
LUBRICATE LEAD SCREW AND FOLLOWER with
Die Makers Grease. Clean lead screw and follower
daily during a production run and relubricate.
OIL CUP “ B ” , Figure 45, ON SIDE OF CHASING
HEAD should be filled weekly with Mobil Velocite No.
6 for lubrication of slide stop pin and cam.
For proper lubrication, AUTOMATIC THREADING
UNIT SHOULD BE C CLED AT LEAST ONCE A
WEEK when not in regular use.
KNOCKOUT ARM GUIDE BAR “ C ” , Figure 47, is a
solid carbide strip. To insure proper operation of
arm, it should be kept lubricated with Die Makers
Grease. Clean guide bar daily and re-lubricate.
NOTE: Oil base cutting fluids are recommended for
maximum life of automatic threading attachment.
TAPERED GIB-LARGE END
HEXAGON WRENCH
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ADJUSTING SCREW "B"
ADJUSTING SCREW "A"
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Figure 46 — Taper Gib Adjustment
/
THREADING UNIT
SERIAL NUMBER
The
serial number for the automatic threading unit
is located on the underside of the attachment on the
dovetail of the main casting, Figure 45. This serial
number should be included in all correspondence
regarding this unit.
CHASING KNOCKOUT
CONTROL DISASSEMBL
1. Disconnect air line at control unit and turn dis 
connect switch on main control case to “ Off ” .
2. Loosen cable grips “ A ” and “ B ” , Figure 48.
3. Remove air line connector “ C ” . Push electric
cables into housing to allow slack for valve housing
remo al.
14
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11. To remove guide bar and knockout piston:
(a) Remove set screw “ A ” , Figure 55. Remove
adjusting collar “ B ” . DO NOT ISPLACE
BRASS PLUG under set screw “ A ” .
(b) Use face spanner wrench to remove nut
“ C ” .
(c) Remove spring “ D ” , Figure 56, and remove
nut “ E'\ Figure 57.
(d) Remove piston shaft “ F ” , Figure 58.
(e) If necessary, loosen two screws “ G ” and
drive out pin "H" to remove guide bar “ J ” .
(f) Remove piston plate “ K ” , Figure 59, O-ring
“ L ” , piston-ring “ M ” , seal “ N ” and O-ring
“ O ” .
(g) Remove O-ring “ P", Figure 60, if neces 
sary.
12. To remove roller clamp piston:
(a) Use face spanner wrench to remove nut
“ Q ” , Figure 55. Remove spring “ R ” , Figure
Figure 48 — Air and Electrical Connections for Knockout Control
61.
(b) Remove nut “ S ” , Figure 62.
(c) Loosen set screw “ T ” , Figure 61, and drive
out dowel pin “ U ” from opposite side
shown. Remove piston shaft, Figure 63.
(d) If necessary, loosen set screw “ V ” and
drive out dowel pin “ W ” to separate piston
shaft “ X ” and bracket “ ” . Cam follower
is removed with a standard screw
“ Z
driver.
(e) Remove piston plate ' ‘ A ” , Figure 64, O-ring
“ B ” , piston ring “ C ” , seal “ D ” and O-ring
“ E ” .
(f) Remove O-ring “ F ” , Figure 65, if neces 
sary.
CHASING KNOCKOUT REASSEMBL
NOTE: Lubricate O-rings, seals and cylinder walls
with Mobil Velocite No. 6 or equivalent during reas 
sembly.
1. To replace roller clamp piston:
(a) Replace O-ring “ F ” , Figure 65.
(b) Replace cam follower “ Z ” , Figure 63.
Replace dowel pin “ W ” through bracket
“ ” and piston shaft “ X ” . Tighten set
screw “ V ” .
(c) Replace piston shaft, Figure 63. Replace
dowel pin “ U ” , Figure 61, and tighten set
screw “ T ” .
(d) Replace O-ring “ E ” , Figure 64, in seal “ D M .
Replace O-ring and seal on piston ring
“ C ” and replace piston ring “ C ” . NOTE:
Use nut “ Q ” , Figure 55, to start these parts
in cylinder wall liner.
(e) Replace O-ring “ B ” , Figure 64, piston
plate “ A ” and nut “ S ” , Figure 62.
(f) Replace spring “ R ” , Figure 61, and nut
“ Q ” Figure 55.
Figure 49 — Knockout Control
10. To remove micro switch mount “ X ” , Figure 52:
(a)
Remove two set screws “ ” and remove
stop collars “ Z ” and “ A ” from trip screw.
DO NOT ISPLACE BRASS PLUGS under
screws
“ ” .
(b) Remove four screws “ B ” , Figure 53, and
remove mount for micro switches.
(c) Remove retaining ring “ C ” , Figure 54.
Push trip screw “ D ” down inside mount
and remove retaining ring “ F ” . Loosen set
screw “ G ” , remove trip screw “ D ” , cam
“ H ” and springs “ J ” .
15

Figure 52 — Micro Switches and Trip
Collars
Figure 50 — Knockout Control
Figure 53 — Bolts for Switch Mount
Figure 54 — Micro Switch Mount and Trip Screw
Figure 51 — Knockout Control Air Valve
16

2. To replace guide bar and knockout piston:
(a) Replace O-ring “ P ” , Figure 60.
(b) Replace guide bar, “ J ” , Figure 58, and
replace pin “ H ” . Adjustment of two screws
“ G ” will be made after knockout assembly
is
replaced on machine.
(c) Replace piston shaft “ F ” , Figure 58. Line
up dowel pin “ Q ” , Figure 60, with locating
hole in piston.
(d) Replace O-ring “ O ” , Figure 59, in seal
“ N ” . Replace O-ring and seal on piston
ring “ M ” and replace piston ring “ M ” .
NOTE: Use nut “ C ” , Figure 55, to start
these parts in cylinder wall liner.
(e) Replace O-ring “ L ” , Figure 59, piston plate
“ K ” and nut “ E ” , Figure 57.
(f) Replace spring “ D", Figure 56, and nut
“ C ” , Figure 55.
(g) Replace adjusting collar “ B ” . Replace
brass plug and set screw “ A ” . Adjustment
of collar "B ” will be made after knockout
assembly is replaced on machine.
3. To replace micro switch mount “ X ” , Figure 52:
(a) Replace trip rod “ D ” , Figure 54, in mount
while replacing springs “ J ” , three re 
taining rings and cam “ H ” . Tighten set
screw “ G ” .
(b) Replace mount and four screws “ B ” , Fig 
ure 53.
(c) Replace stop collars “ Z ” and “ A ” , Figure
52, two brass plugs and two screws “ ” .
Adjustment of stop collars will be made
after knockout assembly is replaced on
machine.
4. To replace micro switches:
(a) Replace micro switches “ G ” and “ H ” , Fig 
ure 50, two screws, washers and nuts “ W ” ,
Figure 52. Mount micro switches as shown
Figure 52. Clearance in mounting holes
will allow micro switches to be set so that
movement of trip rod in either direction
will trip the intended switch and both will
be released at rest position.
(b) Replace red wire from air valve on “ nor 
mally open ” terminal of micro switch “ H ” ,
Figure 50. Replace red jumper wire on
“ common ” terminal of switch “ H ” .
D
Figure 56 — Spring for Knockout Piston
5. To replace air valve:
(a) Replace air valve and three screws “ F ” ,
Figure 50. NOTE: Spring “ A ” , Figure 66,
must be in hole “ B ” . Adjusting screws “ C”
control air exhaust rate and are set in
“ open ” position. Turn screws "C ” coun 
terclockwise to limit.
(b) Replace elbow “ V ” , Figure 50, nipple “ U ” ,
coupling “ T ” and exhaust silencer “ S ” .
(c) Replace nipple “ R ” , spring “ Q ” , washer
“ P ” , felt “ O ” and coupling “ N ” .
(d) Replace red wire on terminal “ M ” , Figure
51.
6. Replace two O-rings “ K ” , Figure 50.
7. Replace final screw “ F ” and white wire from
main switch case. Replace black wire from same
cable and red jumper wire on “ common ” terminal of
micro switch “ G ” .
8. Replace wire from chasing head on terminal
screw “ J ” of air valve. Replace wire from same cable
on “ normally open ” terminal of switch “ G ” .
9. Replace valve housing over two dowel pins
“ E ” , Figure 49, and replace four screws “ D ” .
10. Pull slack from electric cables out of housing
and tighten cable grips “ A ” and “ B ” , Figure 48.
11. Replace air line connector “ C ” .
12. Turn disconnect switch on main control case to
“ On ” .
13. To adjust stop collar “ A ” , Figure 52:
(a)
Raise automatic threading unit and push
the threading attachment toward head-
stock. Place 1 / 32 '' shim at “ A ” , Figure 67,
and lower threading unit in to operating
position. Pull cycle start knob.
(b) Turn collar slowly into trip fork until click
is heard from solenoid in air valve. Tighten
lock screw in collar to maintain setting and
remove shim. Connect air line at control
unit.
14. Adjust guide bar “ J ” , Figure 58, stop collar
“ Z ” , Figure 52, or adjusting collar “ B ” , Figure 55, per
instructions in “ Operator's Manual for Automatic
Threading Units on Model HC Chucking Machines"
under “ Parallelism ” , “ Thread Length Adjustment ”
and “ Threading Tool Retraction ” respectively.
Figure 55 — Cover Nuts for Pistons
17

Figure 60 — Seal and Locating Pin for Knockout Piston
Figure 61 — Spring for Roller Clamp Piston
Figure 58 — Knockout Piston Shaft Removal
Figure 62 — Spanner Nut for Roller Clamp Piston
Figure 59 — Piston Rings and Seals for Knockout Piston
All adjustments, including spring tension are fac 
tory set in this proven trouble free unit.
If the chasing bar appears to be hanging
mounting nuts “ C ” are probably unevenly
tightened causing distortation in the mounting
bracket.
Should
this assembly ever require service, return
threading unit to factory. Unit should be properly
greased to prevent rust.
MOUNTING BRACKET AND
CHASING BAR ASSEMBL
up,
or over
The mounting bracket and chasing bar assembly
“ B ” , Figure 67, is housed as a unit and is properly
sealed to exclude dirt and foreign matter. The super-
honed chasing bar rides on 144 selected, properly
greased, balls in two bearing races.
18